Ebonex-Supported PtM Anode Catalysts for PEM Water Electrolysis

G. Borisov; A. Stoyanova; E. Lefterova; S. Vasilev; E. Slavcheva

G. Borisov Institute of Electrochemistry and Energy Systems BAS, 10 G. Bonchev Str., BG-1113 Sofia.
A. Stoyanova Institute of Electrochemistry and Energy Systems BAS, 10 G. Bonchev Str., BG-1113 Sofia.
E. Lefterova Institute of Electrochemistry and Energy Systems BAS, 10 G. Bonchev Str., BG-1113 Sofia.
S. Vasilev Institute of Electrochemistry and Energy Systems BAS, 10 G. Bonchev Str., BG-1113 Sofia.
E. Slavcheva Institute of Electrochemistry and Energy Systems BAS, 10 G. Bonchev Str., BG-1113 Sofia.

Keywords: Polymer Electrolyte Membrane Water Electrolysis, Pt-Based Bimetallic Catalysts, Magnelli Phase Titania, Oxygen Evolution Reaction, Carbon-Free Gas Diffusion Layer.

Abstract

The work presents a research on the preparation of Pt-based bimetallic catalysts dispersed on commercial Magnelli phase titania (Ebonex^@) by sol gel method and investigation of their activity toward the oxygen evolution reaction (OER) in polymer electrolyte membrane water electrolysis (PEMWE). The catalytic support is also used for preparation of a carbon-free gas diffusion layer (ET30) integrated in the oxygen electrode of the membrane electrode assembly (MEA). The performance characteristics of MEA with PtM/Ebonex on ET30 are investigated in a laboratory PEMWE and compared to those of MEA with commercial carbon-based GDL with the same anode catalyst. It is proven that the chemical nature and electron density of the second metal have an essential effect on the catalyst surface structure and properties, including the lattice parameter, particle size, and electronic surface state state which in turn, reflect on the electrochemical behavior and catalytic activity. The catalysts PtCr/Ebonex and PtMn/Ebonex having deficiency of electrons in the valent d-orbital do not form an alloy with Pt and have lower catalytic activity. In contrast, the metallic components in PtFe/Ebonex and PtCo/Ebonex form a solid solution which results in changes in the catalyst structure and surface electron state, leading to enhanced OER efficieny compared to pure Pt/Ebonex.

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